GoolRC 4Pcs 15A ESC 2S-4S Battery Brushless Motor Speed Controller for RC QAV250 F330 Mini Quadcopters<br> <br> Features:<br> No low voltage cutoff<br> Low voltage auto setting based on battery<br> Safe power arming program ensures motor will not run accidentally after turn on<br> <br> Specification:<br> Constant Current: 15A<br> Input Volt: 2S-4S Li Battery<br> Max Current: 25A(10s)<br> BEC input: 5V2A<br> Compatible signal frequency: 30Hz - 499Hz<br> <br> Package Information:<br> Package size: 12 * 9.5 * 2cm / 4.7 * 3.7 * 0.8in<br> Package weight: 85g / 3oz<br> Adhesive taps package<br> <br> Package List：<br> 4 * 2-4s 15A Brushless ESC<br>  <br>  <br>  <br>  <br>  <br>  <br>